Apparatus for forming concrete piles



'March 7, 1933. R TADA APPARATUS FOR FORMING CONCRETE PILES Filed Feb.5, 1951 2 sheets-sheet l IIIIII r sm l r Il In utllllll'l. ll ,lilillu..

Sheet 2 2 'sheets- March 7, 1933. R. TADA vAPPARATUS FOR FORMINC-CONCRETE PILES Filed Feb. 3, 1951 Patented Mar. 7, 1933 *RENZO-,rapa orATOKYO-FU, JAPAN APPARATUS ron. romaine concnnrn 'ruins Application wledFebruary 3, y1931,*Sera1 No.4513,i173, andn Japan OctcberfiS, i930. i i

mentioned, simple in construction and e'ective in operation v,for ystamping concrete charge. y

In apparatus of this type devised hitherto,

an outer and an inner tube are provided, andl after both tubes have beendriven into the ground by a steam hammer, the inner tube isy utilized tostamp a charge of concrete supplied through the bore of the inner tube.In

the said apparatus, it has been found that the lower `or stamping 'endof the inner tubeis easily liable to damage or renderedineectiv'e inoperation, owing tothe heavy stamping force and a relativelycomplicated'construction of the lower end. The main obj ect is to removethese difficulties. Y

With this in view, thisinvention consists of an apparatus for forming aconcrete pile having enlarged parts, one above the other, along itsentire length, comprising in combination an outer tube; a plate shoe forthe same; an inner tube adapted to be concentrically arranged within theouter tube;` a valve plate pivoted on the lower end of the inner tube;and means for operating the valve plate and opening or closing the lowerend of the inner tube to discharge concrete material through the bore ofthe inner tube, or cut oft' the discharge; and means detachablyconnected to the lower end of the inner'tube for protecting the valveplate. l

Another object of this invention is to provide an apparatus of the kindabove-mentioned wherein a rope or the like attached at one end to thepivoted valve plate and extended to the top of the inner tube isprovided for operating the valve plate.

A further object of this invention is to provide an apparatus of thekind, comprising ay an apparatus constructed according Vto thisinvention. I j

Fig. 2 is a view similar to F ig. 1 and shows an operation of theapparatus i wherein a charge ot' concrete is supplied below the lower-55 end of the inner tube and tamped by the innerl` ltube with theconical shoe.

"y Fig. 3 is a view similarto Fig. 2 and shows an operation of theapparatus wherein, after the `lowest concrete enlargement has beenformedbelow the lower end of the outer tube andan assembledreinforcement and 'inner-v tube have been inserted into the'outer tube,the valve plate is opened to discharge a part of the concrete from theinterior of the inner tube."y i l' Fig. is a front view, partly. insection, of the` apparatus showing its operation in stamping the topvsurface of the chargedconi crete by the inner tube after a charge ofcon-` h crete `through the inner tube, hasbeenv coinpleted and the valveplate closed.

Fig. '5VA shows ay concrete pile formed by'` the apparatus according tothis invention, the said pile'being provided on the lower end75 with agreater enlarged part, and the stem part of the pile being ormed'by asuccession `of smaller enlarged parts. l Y

vFig. 6 shows a longitudinal section'of the lower part of th-eapparatus. 1 80 Y Fig. '7' shows a cross section thereof.,V

In. the drawings, (l) is the plate shoev for protecting the end of theouter tube while. the tube is driven into the ground. (2) is the i outertube made of a metal such as steel.v `(3) l 5' is the inner metallictube. (ll) is the conical solid metallic shoe detachably connected to.the lower end of the inner tube. (5) is a transverse pin for connectingthe shoe (il) lto the inner tube. (6') isthe valve plate pivoted on thelower end of the inner tube so as to` be opened or closed. (7) is a ropecnnected at one end to the plate (6) and extended to the top of theinner tube. (8) is a ring attached tothe top end of the rope (7) foroperating the same. (9) is abridge piecefor supporting the said ring.,(10) is an 'assembled reinforcement comprising a pluralityol:lvertically arranged parallel reinforcing rods surrounded by `a spiralwire as shown in dotted lines in Figs. 3 and 4. (l1) 'is a mass ofconcrete forming the greater enlarged part.

The outer tube (2) is provided at the top and bottom respectively with areinforcing ring 2a, and the bottom is frictionally tted with theconical plate shoe The shoe (l) is left inthe ground when the outer tube(2) with the plate shoe and inner tube has beendriven into the groundand then lifted for a distance. The inner tube (3,) has a diameter sothat a space is left between the outer and inner tubes when the lattertube is inserted into the former tube. conical shoe (el) is formed atits upper end with a cylindrical flange la which isremovably connectedtothe lower end of the inner tube (3) by means of the transverse pin (5)passing through the flange and inner tube.

, In operation of this apparatus for formingV a concrete pile in theground, the plateshoe (l) 'is frictionally fitted to the outer tube (2),while the solid shoe (fl) is connected to the inner tube by means ofthetransverse pin Then both tubes are assembled as shown in Fig. l, anddriven into the ground by means of a steam Vhammer not shown.

When the assembled tubes have been driven to a desired depth, the innertube 3) is withdrawn from the outer tube anda suitable quantity ofconcretey material (11) is charged into-the outer tube (2). Then theinner tube (3) with the conical shoe (il) is inserted again and the mass(11) of the concrete material is stamped repeatedly by the hammeringaction of the steamv ,hammer given to the top of the inner tube (3)whereby the lowest enlarged concrete lpart 1s formed on the plate shoe(l) which has been further driven by the mass of concrete during itsstamping. Then the inner tube (3) is withdrawn again from the outer tube(2),

and the assembled reinforcement (l0) having a shape of a cylindricalcage opened on both ends is inserted into the outer tube. The solidconical shoe (a) is removed from the inner tube (3) which is theninserted into the outer tube (2) as before, the reinforcement being leftin a space between the outer and inner tube. By loosening the rope (7),the valve plate (6) may be opened so as to charge a suitable quantitvof concrete on the lowest enlarged part of the concrete pile. After thematerial has been charged, the valve plate (6) is closed by means ,ofthe rope (7) and the material is repeatedly stamped by the inner tubeend while the outer tube is withdrawn, whereby a relatively smallerenlarged part is lintegrally formed on the lowermost enlarged part. `Theoperation is repeatedly carried out, .whereby there is formed a concretepile of a desired length having a relatively larger lowest enlargedVpart and stem part composed of a succession of relatively smallerenlarged parts.

The solid' For driving the assembled tube into the ground and-formingthe lowest enlarged part of the pile, a succession of powerful hammeringoperations of the assembled tube and then of the inner tube isnecessary. By this powerful hammering operation, however, the lower endof the inner tube and its shoe are easily liable to damage. Y In thisinvention, a solid conical strong shoe is used, whereby the said defectis removed. If necessary, the shoe can be easily removed and renewed.Also by the use ofthe pivoted valveplate, the construction of the lowervend of the inner tube is considerably simplified and made stronger,whereby the effective stamping operation can be carried out.

I claim: Y

Apparatus for forminga concrete pile having superimposed radiallenlargements Vand an enlarged footing,y comprising an outer tube adaptedto be raised alternatively through fractions of the height of the pileunder construction, said outer tube having a' detachable shoe at itslower end, an inner tube of less diameter than the outer tubeand adaptedto be rammed, a valve plate pivot-ally mounted at vthe lower end oftheinner tube, an operating cord passing into the inner tube andattached to the vsaid valve plate, and a conical tamping shoe detachablyconnected to the lowerend of the inner tube, said tampingl shoe beingremoved after the formation of the enlarged footing so that the pile isformed continuously afterwards without withdrawing the inner tube out ofthe outer tube.

In testimony whereof, I have signed my ice name to lthis specificationat Tokyo, Japan, v i

las

